When the bike is in first hold in the clutch and rev it a little bit. If it feels like its trying to pull away (even a little) then you probably have a clutch problem. If its fully disengaged it shouldn't try to pull away when holding the clutch in. Just a simple idea to try.
It all depends on how much "jerk" forward you get, It could be a clutch adjustment problem, or if you replaced the oil after you dropped and repaired it, it could be the new "thicker" oil that tends to do this, or if the weather is very cold.
Does it still do it when the oil has heated up a bit???
A lot of bikes have got a little bit of "jerking" forward if it was in neutral and you shift into first.
If this is only slightly, it should not be something serious. Like the previous guys said, try first to determine if the clutch do release completely when pulled in.
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